The diphenyl-dihydronaphthopyrylium thiocyanate (8) reacts with aryl amines to give the corresponding N-aryl-dihydrobenzoquinolinium thiocyanates (9)(average yield 88%) which thermolyse smoothly at ca. 200 °C to the aryl thiocyanates (average yield 69%).
A. R. Katritzky and S. S. Thind, J. Chem. Soc., Chem. Commun., 1979, 138 DOI: 10.1039/C39790000138
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